Boiler blowdown is the removal of water from a boiler. Its purpose is to control boiler water parameters within prescribed limits to minimize scale, corrosion, carryover, and other specific problems. Blowdown is also used to remove suspended solids present in the system.
Regular sewage discharge and continuous sewage discharge
Boiler blowdown is divided into regular blowdown and continuous blowdown. The entrance of the continuous blowdown pipe is installed below the water surface of the steam drum and is arranged along the entire length of the steam drum to drain part of the boiler water continuously and uninterruptedly. The regular sewage discharge inlet is at the lowest part of the boiler where there is a lot of precipitated water and slag. Most of them are discharged from the lower header of the water wall. The discharge is done at a certain interval, mainly to release the water slag precipitated by the boiler water.